Delete row sig_cb286bc5018e from signals

id sig_cb286bc5018e
event_id evt_921f6d7995d6
watcher_id NULL
signal_type news_headline_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source news_rss
reason_trace {"_evidence_event_ids":["evt_d4bbabbfe ...
dedupe_key signal_enriched:news_delta:bfe5a01e378dd74e
throttle_s 0
created_at 2026-04-20T06:38:56.439896+00:00
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